#include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define vec_input(v) for(auto it=v.begin();it!=v.end();it++){cin>>*it;}
#define vec_output(v) for(auto it=v.begin();it!=v.end();it++){if(it!=v.begin())cout<<" ";cout<<*it;}cout<<endl;
#define vec_debug(v) for(auto it=v.begin();it!=v.end();it++){cerr<<*it<<" ";}cerr<<endl;
#define yn(ans) cout<<(ans?"Yes":"No")<<endl
#define YN(ans) cout<<(ans?"YES":"NO")<<endl
#define umap unordered_map
#define uset unordered_set
using namespace std;
using ll = long long;
template <typename T>T digitsum(T n);
template <typename T>bool isPrime(T n);
template <typename T>vector<pair<T, T>> prime_factor(T n);
long long int intpow(long long int,long long int);
template <typename T>T intlog(T);
long long int combination(long long int,long long int);
long long int arith_sum1(long long int,long long int,long long int);
long long int arith_sum2(long long int,long long int,long long int);
long long int series_sum(long long int);

int main(){
    int a,b,c,d,ans;
    cin>>a>>b>>c>>d;
    if(a+b<=d){
        if(a*c<=b){
            ans=a;
        }else{
            ans=b/c;
        }
    }else{
        if(c*d/(c+1)<=b){
            ans=min(a,d/(c+1));
        }else{
            ans=min(a,b/c);
        }
    }
    cout<<ans<<endl;
}